Stem Structure and Function Concepts

This video tutorial explores the external and internal anatomy of a dicotyledon stem. It covers the structure of the stem, including nodes, internodes, and the terminal bud. The video explains the three types of tissue found in the stem: dermal, ground, and vascular. It details the layers within the stem, such as the epidermis, cortex, and pith, and describes the function of vascular bundles, including xylem and phloem. The tutorial concludes with a summary of the stem's anatomy and its role in plant growth and nutrient transport.

What is the primary function of the terminal bud at the shoot apex of a dicotyledon stem?

• To protect the stem

• To store nutrients

• To transport water

• To facilitate growth

Which type of tissue is responsible for the protective outer layer of the stem?

• Ground tissue

• Dermal tissue

• Vascular tissue

• Parenchyma

What is the role of the cuticle layer in the epidermis?

• To provide structural support

• To store water

• To protect the stem

• To transport nutrients

Which cells in the hypodermis provide structural support to the stem?

• Sclerenchyma cells

• Parenchyma cells

• Collenchyma cells

• Epidermal cells

What is the function of the endodermis in the cortex?

• To transport water

• To store starch grains

• To protect the stem

• To separate vascular bundles

What separates the cortex from the vascular bundles in the stem?

• Medullary rays

• Epidermis

• Pericycle

• Pith

In a dicotyledon stem, where is the phloem located in relation to the xylem?

• Interior to the xylem

• Exterior to the xylem

• Above the xylem

• Below the xylem

What is the primary role of the xylem in the vascular tissue?

• To transport water

• To protect the stem

• To store nutrients

• To transport food products

What is the function of the medullary rays in the stem?

• To store starch grains

• To separate the cortex

• To transport water and nutrients

• To protect the stem

What type of cells make up the central pith in the stem?

• Sclerenchyma cells

• Collenchyma cells

• Epidermal cells

• Parenchyma cells